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Facilitated Diffusion Diffusion Active Transport ATP Passive Transport Active Transport Does this kayaker need to spend his energy in order to move? Active Transport • Defined: Molecules move from a LOW to a HIGH concentration – Against (up) the concentration gradient • ATP energy opens/closes protein channel – ATP = Adenosine Triphosphate • Acts like a pump ATP Active Transport Video Contractile vacuole of a Paramecium The contractile vacuole pumps out the excess water. This is an example Water diffuses into the Paramecium… of active transport. . . . . . . . . . . . . . . . . . . Paramecium . . . . .... Contractile vacuole . . . . . . . . . . . . . . .contractile . squirt excess . it could Paramecia If The Lets too zoom muchin… live water in vacuole… watery diffuses environments… contracts… into Paramecium, to water burst outand . the . . . Very similar to a bilge on a boat . . . . . die… . . . . . . . . . . . Endocytosis • Endocytosis: Process in which the plasma membrane takes in substances (2 types) – 1) Phagocytosis: when a cell engulfs a solid particle – WBCs are called phagocytes – 2) Pinocytosis: when a cell engulfs a liquid particle Endocytosis & the lysosome The bacteria is engulfed by phagocytosis The bacteria is placed inside a lysosome are destroyed Endocytosis • Endocytosis: Process in which the plasma membrane takes in substances (2 types) – 1) Phagocytosis: when a cell engulfs a solid particle – WBCs are called phagocytes – 2) Pinocytosis: when a cell engulfs a liquid particle • Unfortunately, viruses can also enter our cells this way receptor virus virus DNA virus virus Exocytosis • Defined: Process when substances are expelled from the cell • Proteins, nutrients, and waste exit by exocytosis • Vesicle carry & release objects through the plasma membrane Review 1) How are active and passive transport different? Similar? 2) Which molecule powers active transport? 3) How are endo- and exocytosis similar? Different? 4) Which cell part controls active transport? 5) Once inside a cell, what actually kills bacteria that have been swallowed by endocytosis? 6) During exocytosis, which organelle fuses with the cell membrane? 7) What are the types of endocytosis?
